docs(api): publish public API beta M2 reference — tests, latest executions, per-test history (APP-1554)

[devin-ai-integration]

Summary

The tests / latest-test-executions / test-executions endpoints are now live (elementary-data/elementary-internal#7331), so their six reference pages stop being hand-written "coming soon" contracts and become generated ones. Each page collapses to the standard openapi stub used by the assets and columns pages.

docs/api-reference/beta/openapi.json is refreshed from the generated snapshot in the API repo (the same file the enforce_up_to_date_openapi check guards), so parameters, filters, enums, and the items / next_cursor / has_more envelope now come from the served schema instead of prose that can drift. Notably the hand-written history page described the direction default in a way the real endpoint does not implement (start_time DESC by default, direction applying to whichever order_by is in play) — the generated schema is authoritative.

No docs.json changes: all six pages were already in the navigation.

Link to Devin session: https://app.devin.ai/sessions/5178cb6e376846f180e423e43f8a4f79
Requested by: @MikaKerman

[linear]

APP-1554

[devin-ai-integration]

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